BLDC Motors

Servo motors are in a leading position in the current market. BLDC motors are motors with specific functions and are abbreviations for brushless DC motors. They can be called electronically commutated motors (abbreviated as ECM or EC motors) or synchronous DC motors.
 
Compared with the brushed motors, the design of brushless motors has a higher power-to-weight ratio, higher speed, better electronic control, and lower maintenance costs. Based on these advantages, brushless DC motors are widely used in scientific and industrial fields.

Controller and the whole mechanism

The BLDC motor is a synchronous motor driven by direct current through an inverter that sends out alternating current to excite each phase of the motor through a closed-loop controller.
 
The controller provides current pulses to the motor windings to control the torque and speed of the motor equipment. In general, the structure of a brushless motor system is very similar to a permanent magnet synchronous motor (PMSM for short). The former can be regarded as a switched reluctance motor or an induction motor, but not a synchronous motor.

 

Advantages of BLDC motor

Servo motors (DC and AC) are commonly used in robot science. Recently, the application of AC servo motors is more common, because the control becomes easier than before, while maintaining excellent torque. However, the price of servo motors is generally high, so it is necessary to install optical sensors with selected resolution. Because of the BLDC motor, many industrial robot arms can move heavy objects with high precision while being cost-effective.
 
Servo motors can be used for many mechanical purposes, such as the power turret of a lathe. Many power turrets are driven by a servo single motor, which can ensure the best processing quality and greatly reduce energy consumption. At the same time, they can also provide high rigidity for the work piece, thereby providing ideal cutting performance.
 
In summary, efficiency is a major advantage because these motors can be continuously controlled at maximum torque. Conversely, the maximum torque can only be achieved when the brushed motor rotates at a specific position. If a brushed motor can provide the same torque as a brushless motor, a larger magnet must be used, which is why even a small BLDC motor can still provide high power.
 
Another point, because there is no brush, BLDC motor also has high durability and extremely low electric noise. In a brushed motor, the brush and commutator will wear out due to continuous contact and generate strong sparks. Therefore, in applications where electric noise must be avoided, BLDC motors are the best choice.

 

Other motor inventories

Linear motor is a device that can produce linear motion without a transmission system. The conventional transmission system includes many components, such as rack and pinion, ball screw, screw, cam, etc, for building a rotary motor.
 
The brushless DC linear motor is composed of a slotted stator with magnetic teeth and a moving actuator. The actuator usually has permanent magnets and coil windings. The motor controller attracts the coil windings in the actuator to guide the activation of the magnetic field, thereby achieving linear motion. 

 

Industrial trend

Currently, in the fields of automation, manufacturers tend to use machining centers with robotic arms to achieve a wider range of applications. The machine is only the most basic structure. It is often the key components of the machines such as the robot arm and automation equipment that determine the product quality and work efficiency. In the 3C consumable electronics field, because of its high efficiency and long life, it is widely used in continuous operation devices. Such as washing machines, air conditioners and other consumer electronic products, because of their high efficiency help to significantly reduce power consumption, in recent years also used in fans and vacuum cleaner drive.
 
In response to the needs of smart manufacturing trends, BLDC motor and machine tool technology has developed rapidly.
 
Especially after the machining center and programmed control system (CNC, computer numerical control) were invented, the machining and product standards became more stringent than before. In addition to CNC machining centers, there are CNC turning centers, CNC milling machines, CNC tapping and milling centers, CNC drilling and milling machines, and other custom-made special machines, all of which can integrate an automated system. Therefore, the new servo motor must be easier to integrate with the automation system and have more versatility in order to be suitable for these efficient and multi-functional machining centers.

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